300kVA 33kv 415V Oil Immersed Distribution Transformer Three Phase Znyn11

You are here: Home » Products » Distribution Transformer » 300kVA 33kv 415V Oil Immersed Distribution Transformer Three Phase Znyn11

300kVA 33kv 415V Oil Immersed Distribution Transformer Three Phase Znyn11

YAWEI manufactures dependable **300kVA three-phase oil immersed distribution transformers** developed for medium-voltage electrical distribution systems. With a rated primary voltage of **33kV** and a secondary voltage of **415V**, this transformer is designed to step down medium-voltage power for reliable low-voltage distribution.

The transformer adopts a **ZNyn11 winding configuration**, providing a suitable connection arrangement for distribution networks requiring a neutral point on the low-voltage side and the specified phase relationship between the high- and low-voltage windings.

Combining a robust oil-filled construction with carefully engineered magnetic and winding components, the transformer is suitable for long-term operation in a variety of power distribution environments. It can be used for residential, commercial, agricultural, industrial, and utility applications where reliable 33kV to 415V voltage transformation is required.

YAWEI applies controlled manufacturing procedures and factory inspection throughout production to provide consistent electrical performance and dependable service for international power distribution projects.

Quantity:
Availability:





Inquire Add to Basket

Model:
DKS-300
Brand:
YAWEI
Code:
-

300kVA Distribution Transformer 33kv to 415v transformer 300kVA Oil Immersed Transformer

PRODUCT CATEGORY

>> Product Introduction

>> Technical Parameters

>> Product Uses

>> Product Operate Guide

>> FAQ

Overview

The 300kVA 33kV/415V three-phase oil immersed distribution transformer is designed for medium-voltage distribution networks that require reliable conversion to a 415V low-voltage supply. With a 33kV primary rating, 415V secondary rating, and ZNyn11 connection group, it provides a practical solution for distributing electrical power to residential, commercial, agricultural, and industrial loads.

Its oil immersed construction provides both electrical insulation and an effective path for transferring heat generated during operation. The transformer can be configured according to the installation environment, electrical system requirements, and applicable project standards.

Core Advantages & Operational Benefits

High-Voltage Distribution Capability

The 33kV primary voltage makes this transformer suitable for medium-voltage distribution networks where higher distribution voltage is required. It provides an efficient step-down interface between the utility or local medium-voltage network and the 415V low-voltage system.

Stable Three-Phase Power Supply

With a rated capacity of 300kVA, the transformer is designed to supply three-phase electrical loads across a range of distribution applications. The 415V secondary output can support building services, machinery, lighting, motors, and other low-voltage equipment.

Reliable Oil Immersed Construction

The active core and windings operate within insulating oil, which provides electrical insulation while facilitating heat transfer. This proven transformer configuration helps maintain stable operating conditions and supports reliable long-term service.

ZNyn11 Connection Configuration

The ZNyn11 connection group provides the specified neutral arrangement and phase relationship between the high-voltage and low-voltage windings. It can be selected to match the requirements of particular distribution networks and system designs.

Robust Design for Distribution Networks

The transformer is manufactured with carefully selected core, winding, insulation, and tank components. Structural integrity and electrical performance are considered throughout the design and production process to support dependable operation under normal service conditions.

>> Technical Parameters

Type	Three‑phase oil‑immersed distribution transformer
Model	DKS-300kVA
Installation	Outdoor
Altitude	≤1000m
Rated Power	300 KVA or others
Cooling Method	ONAN
Primary Voltage	33 kV
Secondary Voltage	0.415 kV
Rated Frequence	50/60HZ
Insulation oil	Mineral oil
Tapping Range	±2×2.5%/±5%
Temperature rise℃)	65 K
Connection Group	Znyn11
Total weight(kg)	Depends on final design

Industry Applications

The 300kVA 33kV/415V oil immersed distribution transformer is suitable for a broad range of medium-voltage power distribution projects. Typical applications include residential developments, commercial facilities, factories, agricultural installations, infrastructure projects, utility networks, and rural electrification systems.

The 415V secondary supply can be used for building electrical systems, lighting networks, motors, pumps, agricultural machinery, small industrial equipment, and other low-voltage loads. The transformer can also serve as part of a larger distribution system where dependable medium-voltage power conversion is required.

Quality Standards, Testing & Manufacturing Control

YAWEI maintains quality control throughout the manufacturing process of its three-phase oil immersed distribution transformers. Incoming materials and major components are inspected before entering production, while manufacturing processes are monitored through core assembly, winding, insulation, tank fabrication, oil treatment, final assembly, and testing.

Before shipment, each transformer is subjected to applicable routine factory inspections and electrical tests. Depending on the project specification and relevant standards, these may include voltage ratio, winding resistance, insulation performance, dielectric withstand, no-load characteristics, and other specified tests.

This systematic inspection process helps verify the transformer's electrical characteristics, mechanical integrity, and overall manufacturing quality before delivery.

Why Choose YAWEI

With more than 30 years of transformer manufacturing experience, YAWEI provides distribution and power transformer solutions for customers in international markets.

Our capabilities cover transformer engineering, manufacturing, testing, and project-specific configuration. Based on customer requirements, we can develop suitable solutions covering rated capacity, voltage ratio, frequency, connection group, impedance, tap range, cooling arrangement, installation conditions, and applicable technical standards.

By combining manufacturing experience with controlled production and systematic testing, YAWEI aims to provide reliable transformer equipment and professional support for diverse power distribution projects.

Generic Installation and Operation Instructions

The following information provides general guidance for the installation and commissioning of the 300kVA 33kV/415V oil immersed distribution transformer. Installation, electrical connection, testing, and energization must be carried out by qualified personnel in accordance with the manufacturer's technical documentation, approved drawings, local regulations, and applicable electrical safety requirements.

1. Preparing the Installation Location

Inspect the installation area before positioning the transformer. The foundation or supporting structure should be level, stable, and capable of safely supporting the equipment. Sufficient clearance should be provided for electrical connections, ventilation, inspection, maintenance, and safe operation.

2. Positioning and Securing the Transformer

Transport and position the transformer using suitable lifting and handling equipment. Use the designated lifting points and follow the manufacturer's handling instructions. Once positioned, confirm that the transformer is correctly aligned and securely fixed before beginning electrical installation.

3. Checking and Installing Transformer Components

Before assembly, inspect the transformer and accessories for any transportation-related damage. Check bushings, terminals, grounding components, mounting hardware, and other supplied accessories. Install and tighten the required components according to the manufacturer's drawings and technical instructions.

4. Connecting the 33kV and 415V Circuits

Connect the 33kV high-voltage side and 415V low-voltage side according to the transformer nameplate, wiring diagram, and approved electrical design. Verify phase identification, neutral connections, grounding, conductor clearances, and terminal tightness before energization.

5. Inspection and Testing Before Energization

Before placing the transformer into service, qualified electrical personnel should complete the required visual, mechanical, and electrical inspections. Depending on the applicable specification, tests may include insulation resistance, winding resistance, voltage ratio, phase relationship, dielectric withstand, grounding continuity, and other routine tests.

The transformer should only be energized after all required inspections and test results have been confirmed to comply with the specified requirements and the complete installation has been verified as safe.

>> FAQ

1. What are the main specifications of this 300kVA distribution transformer?

This is a 300kVA three-phase oil immersed distribution transformer with a 33kV primary voltage and 415V secondary voltage. The transformer uses a ZNyn11 connection group and is designed for medium-voltage to low-voltage power distribution.
2. What does ZNyn11 mean?

ZNyn11 describes the winding connection arrangement and phase displacement of the transformer. The designation identifies the neutral arrangement of the windings and specifies the corresponding phase relationship between the high-voltage and low-voltage sides. The exact connection should always be verified against the transformer nameplate and approved project drawings.
3. What applications are suitable for a 33kV/415V 300kVA transformer?

This transformer can be used in residential, commercial, agricultural, industrial, infrastructure, and utility distribution systems. Typical loads include lighting, motors, pumps, building services, agricultural equipment, and other 415V electrical equipment.
4. What tests are performed before shipment?

YAWEI performs applicable routine factory inspections and electrical tests before delivery. Depending on the applicable standard and customer specification, testing can include voltage ratio, winding resistance, insulation performance, dielectric withstand, no-load characteristics, and other required routine tests.
5. Can YAWEI customize this 300kVA transformer?

Yes. YAWEI can develop transformer configurations according to specific project requirements, including primary and secondary voltage, frequency, connection group, impedance, tap range, cooling method, installation environment, and applicable standards. Customers can provide their technical specifications for engineering evaluation.